JPH0711191B2 - Beam construction method and beam construction cradle in reinforced concrete structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a beam in a reinforced concrete building and a beam construction cradle used in this method.

[0002]

2. Description of the Related Art Conventionally, when constructing a beam in a reinforced concrete building, the reinforcing rod was processed on site to assemble the beam. Alternatively, the pre-assembled beam rebar structure manufactured at the factory was installed in the groove of the beam construction form using a permanent crane at the site. Alternatively, a large number of pieces of wood, etc. may be erected above the groove of the beam building formwork, and the pre-assembled beam rebar structure may be installed at a predetermined position on the piece of wood using a permanent site crane, and then the pieces of wood, etc. may be molded from the end. While being removed from the frame, the pre-assembled beam rebar structure was gradually installed from the end into the groove of the beam building formwork.

[0003]

Since the conventional method for processing a reinforcing bar in the field requires a large number of skilled workers, there is a possibility that accuracy may vary and the construction period may be extended due to lack of skilled workers in recent years. There was a problem that occurred.

Further, in the method of arranging the pre-assembled beam rebar structures by using a permanent crane on site, each pre-assembled beam rebar structure must be lifted and supported by the crane until the installation is completed. When using the pre-assembled beam reinforced concrete structure, the number of cranes is limited, so it takes time, and the crane cannot be used for other work until the beam assembly is completed. There was a point.

Further, in the method of supporting the pre-assembled beam rebar structure with a piece of wood and gradually installing it in the groove for forming the beam construction form, after the installation, the pre-assembled beam rebar structure is bent and the form frame for constructing the beam is formed. Since the pre-assembled beam rebar structure cannot be moved and adjusted after being installed in the groove, there is a problem that a predetermined cover thickness cannot be obtained when the installation position is displaced.

[0006]

SUMMARY OF THE INVENTION However, according to the present invention, a winch is erected on the upper ends of the column main reinforcing bars at both ends of the beam construction planned position, and the beam is constructed by suspending the pre-assembled beam rebar structure with the winch. Therefore, the above problems have been solved.

That is, according to the present invention, in a method of installing and constructing a pre-assembled beam rebar structure in a formwork in a reinforced concrete building, after constructing the column main rebar and the formwork, The pre-assembled beam rebar structure is arranged above, and winches are temporarily installed at the upper ends of the column main rebars located around both ends of the beam construction planned position, and both ends of the pre-assembled beam rebar structure are described above. After hanging on both winches,
Beam construction in a reinforced concrete building characterized by gradually lowering the pre-assembled beam reinforced structure and arranging it at a predetermined beam construction planned position, and then removing the winch from the column main reinforcement and the pre-assembled beam reinforced structure Is the way.

Further, in a reinforced concrete building,
A wire lowering part is installed in the center of the horizontal rod with connecting metal fittings attached to the upper end of the pillar main rebar, and the upper end of the wire connecting the beam supporting part to the lower end of the wire lowering part. It is a pedestal for beam construction characterized in that a part is attached. In addition, the metal fittings and the horizontal rod are slidably attached, or the wire slip prevention part is installed on the horizontal rod,
It is a beam construction pedestal in which an intermediate portion of a wire is hooked on the anti-slip portion.

In the above description, the winch is an unwinding machine having an elevating means and a hanging means by manual winding or mechanical winding, and the structure of the receiving stand is an example thereof.

Further, in the above, the pre-assembled beam reinforcing bar structure is formed by winding a predetermined number of beam main reinforcing bars with stab reinforcing bars.

Further, in the above description, the beam supporting portion may be a beam supporting rod for locking the entire upper end bar of the beam, or a beam supporting ring for locking each of both ends of the upper bar of the beam top.

[0012]

In the present invention, the winch is erected on the upper end of the column main rebar and the pre-assembled beam rebar structure is suspended by the winch. Therefore, the pre-assembled beam rebar structure is installed in the beam formwork in a substantially horizontal state. it can.

[0013]

Embodiments of the present invention will be described with reference to the drawings.

[0014]Structure of pre-assembled beam rebar structure  The beam top main bars A, A and the beam bottom main bars B, B should be in place.
The beam upper end main bars A, A, the beam lower end main bars B, B.
Instead, wrap the stirrup reinforcing bars C and C,
The structure D is formed (FIG. 1B). In the above, the corner
When connecting the beam to the column of the section, the beam top main bar A and the beam bottom
The end of the main muscle B may be bent downward (in FIG. 4, a chain line).
(Shown).

[0015]Structure of cradle (end)  Attach the unwinding part 2 to the center of the horizontal rod 1 made of square pipe.
Kick In the above description, the unwinding part 2 is a frame plate 3 having a gate-shaped cross section.
Insert the winding cylinder 4 into the through holes of both vertical pieces 3a, 3a of
When the through hole 5 is formed in the central portion of the horizontal piece 3b of the frame plate 3,
A nut 6 is fixed to the edge of the through hole 5 and the nut
The screw rod 7 in which the grip rod 7a is continuously provided on the head is screwed into the
The wall of the winding cylinder 4 at a position where the tip 7b of the threaded rod 7 abuts
Fixing holes 8, 8 are formed in the
Hook the take-up rod (handle for rotating the take-up cylinder 4) on the
The locking cylinders 9 are arranged in series (FIG. 5). Said smell
The wire catching projections 1 on both ends of the winding cylinder 4.
0 and 11 are provided in a protruding manner, and the winding cylinder 4 is provided with the horizontal rod 1
Is located at a right angle to the
It is located outside of the rod 1.

Next, a rectangular prism 13 having a shape and a size capable of inserting the horizontal rod 1 and a side wall of the prism 12 having both ends open is provided.
(Insert the column main rebar 42) is fixed at a right angle to the square tube 12 with the open edge 13a facing downward. The above-mentioned square cylinder 1
3, a pressing member 14 having an L-shaped cross section is provided on the side wall of the rectangular tube 12 below the open edge 13a of No. 3 to form a connecting fitting 15. Connection fittings 15 and 15 are slidably inserted into both ends of the horizontal rod 1 (FIG. 6).

Next, on one side surface 1a of the horizontal rod 1, between the lowering portion 2 and one of the connecting fittings 15, short cylinders 17, 18 are provided.
Are projected at a predetermined interval. A strip plate 19 for connecting both edges of the short cylinders 17 and 18 is fixed to prevent the wire from slipping.
3 is formed. Similarly, the other side surface 1b of the horizontal rod 1
In addition, short tubes 20 and 21 are projectingly provided between the lowering portion 2 and the other connecting fitting 16 at a predetermined interval, and a band plate 22 that connects both edges of the short tubes 20 and 21 is fixed. Then, the non-slip portion 24 of the wire is formed (FIG. 3).

Next, the base end 25b of the wire 25 having the annular hooking portion 25a at the tip is hooked and fixed to the projection 10 of the winding cylinder 4, and the wire 25 is a short cylinder of the slip preventing portion 23. After being hooked on the side walls 17 and 18, they are lowered downward. Similarly, the base end 26b of the wire 26 having the annular hooking portion 26a at the tip is hooked and fixed to the protrusion 11 of the winding cylinder 4, and the wire 26 is a short cylinder of the slip stopper 24. After being hooked on each side wall of 20, 21, it is lowered downward (FIG. 3).

Next, a beam support rod 29, to which the inverted U-shaped hooking metal fittings 27, 28 are rotatably attached to both ends, is arranged below the horizontal rod (FIG. 3). After inserting the tip of the wire 25 into the hook 27, the annular hook 25a of the wire 25 is hooked to one end of the beam support rod 29 (FIG. 9). Similarly, after inserting the tip of the wire 26 into the hook 28, the annular hook 26a of the wire 26 is hooked to the other end of the beam support rod 29 to form the pedestal 30. .

Also, for one pillar, there are two (part E in FIG. 1A), three (part F and part G), and four (part H).
When constructing a plurality of beams, the connecting fittings as shown in FIGS. 7 and 8 are used together with the connecting fitting 15.
That is, a vertical angled tube 52 (having a height lower than that of the vertical angled tube 13, which will be described later) is opened on the side wall of the rectangular tube 51 having a shape and a size that allows the horizontal rod 1 to be inserted therein similar to the connecting fitting 15. Edge 52
It is fixed at a right angle to the square tube 51 with a facing downward. A connecting member 54 is formed by projecting a pressing member 53 made of a rectangular plate piece on the side wall of the square tube 51 below the open edge 52a of the topped square tube 52 (FIG. 7). In the above, as shown in FIG. 8, the connecting metal fitting 54 having the horizontal rod 1 inserted therein is installed on the horizontal rod 1 fitted with the connecting metal fitting 15 so that both horizontal rods 1 are orthogonal to each other. In the state where
The position of the upper end 13b of the eccentric square tube 13 and the connecting fitting 5
The size of the eccentric square tube 52 and the fixing position of the eccentric square tube 52 and the square tube 51 are set so that the position of the upper end 52b of the eccentric square tube 52 of No. 4 is the same in the vertical direction. ing.
In addition, the connecting fitting at the position where the receiving stand 30 overlaps is shown in FIG.
In such a state, the connecting fitting 55 fixed to the connecting fitting 15 and the connecting fitting 54, or the connecting fitting 56 (not shown) in which the connecting fitting 55 is formed in plane symmetry is used.

[0021]Structure of receiving stand (middle part)  In addition, the beam reinforcement structure is supported at the position between the columns and the middle of the columns.
The receiving stand 31 is the same as the receiving stand 30 at both ends of the horizontal rod 1.
And the upper end portions 32a of the inverted T-shaped pedestals 32 are respectively projected.
It The lower end 32b of the pedestal contacts the floor of the formwork. Well
In addition, the lowering part 2 and the wire slide on the central part of the horizontal rod 32.
Form the stoppers 23, 24 and remove the wires 25, 26
Attach the support rod 29 to the tip of the wires 26, 26.
And the receiving stand 31 is constructed (FIG. 10).

[0022]Beam carrier  In addition, the beam carrier used for carrying out the present invention is shown in FIG.
To form. That is, the support pillar is mounted on the flat U-shaped base 33.
34 is erected vertically, and is attached to the tip portion 34a of the support column 34.
The hanging rod 35 is provided so as to project at a right angle. On the lower surface of the hanging rod 35
Attach the hook 36 and attach it to the hook 36
The chain 38 with the interposition of the ring 37 is hooked. Lower end of the chain 38
Attach the hook 39 to. At the lower end of the hook 39,
Beam stop rod 4 via the rope 46 (string or wire is also acceptable)
Attach 5. Also, the wheels 40,
40 is attached to form a beam carriage 41 (see FIG. 1).
1). The wheel 40 has a base end portion 40a that rotates about an axis of 18
It is formed so as to be rotatable by 0 degrees (in FIG. 11, a chain line 40b
Position of). In the above, the wheel 40 is taken from the base end 40a.
It can also be removed freely.

[0023]Beam construction method  Next, the construction method of this invention using each of the above devices will be described.
It

A beam construction form 43 is constructed at the planned beam construction position, and main rebars for columns 42, 4 at one end of the planned beam construction position are constructed.
2 projects about 1 m from the mold floor 44 (Fig. 1
(A)).

The pre-assembled beam rebar structure D is arranged above the beam construction form 43 by using a site permanent crane. Alternatively, the pre-assembled beam rebar structure D is carried up to a predetermined position on the formwork floor surface 44 by a site permanent crane or the like, and then the beam retaining rod 45 of the beam carrier truck 41 of the pre-assembled beam structure D. The pre-assembled beam reinforcing bar structure D is suspended and carried around the center, and the beam carrier 41 crosses the beam constructing frame 43 to move the pre-assembled beam reinforcing bar structure D to the beam constructing frame 43. It is placed above (FIG. 1 (b)).

Next, the tops of the column reinforcing bars 42 are inserted into the eccentric square tubes 13 of the connecting fittings 15 of the receiving frame 30, and the receiving frame 30 is installed on the upper ends of the column main reinforcing bars 42, 42.
In the above description, since the connecting fitting 15 of the receiving stand 30 is slidably fitted to the horizontal rod 1, the main rebars for columns 42, 4
The cradle 30 can be erected on the main rebar for the column depending on the interval of 2. Similarly, the pedestal 30 is erected on the upper ends of the column main reinforcing bars 42, 42 at the other end of the beam construction planned position (FIG. 1).
(B)). Similarly, the pedestal 30 is erected on the main rebars 42, 42 for pillars required to install all the pre-assembled beam rebar structures D.

In the above description, as shown in FIG. 2 (b), each pedestal 30 has a connecting metal fitting 15 at E ₁ , F ₁ , and F ₃ ,
E _3, G _3, and G ₄ in the connecting fitting _{54, F 3, G 1,} H
₁ and H ₃ , the connecting fitting 55 is connected to E ₂ , F ₂ , G ₂ ,
The connecting fittings 56 are used for H ₂ and H ₄ , respectively.

Further, in the portion where the pre-assembled beam reinforcing bar structure D is not sufficient only with the receiving stands 30, 30 at both ends (when the pre-assembled beam reinforcing bar structure D is long or heavy, etc.),
The cradle 31 is used to support the intermediate portion of the pre-assembled beam rebar structure D (FIGS. 1B and 1C).

Next, both ends of the pre-assembled beam rebar structure D are hooked on the beam supporting rods 29 of the receiving base 30 (FIG. 1).
(C)). In this state, the crane or the beam carrier 41 is removed from the pre-assembled beam rebar structure D.

Similarly, the pre-assembled beam rebar structures D are arranged on all the beam construction forms 43, and all the receiving stands 30,
The end portion of the pre-assembled beam rebar structure D is hooked on the beam support rod 29 of 30.

Next, the screw rods 7 of the unwinding section 2 are attached to each receiving stand 30.
Is loosened and the wires 25 and 26 are gradually pulled out, and the pre-assembled beam rebar structure D is installed at a predetermined position in the beam construction form 43. After the installation is completed, the beam support rods 29 of the receiving stands 30 and 31
From the above, the annular retaining portion 25a of the wire 25 is removed, the beam support rod 29 is removed from the pre-assembled beam rebar structure D, and the pedestals 30 and 31 are removed from the column main rebars 42 and 42, and the beam construction is completed. Next, after constructing a predetermined floor reinforcing bar arrangement and the like, concrete is poured.

[0032]Other configurations  In the above embodiment, all of the receiving stands 30, 31 are
If the lowering section 2 cannot be operated, for example,
Operate the lowering parts 2 of the receiving stands 30 and 31 collectively for each direction.
However, the pre-assembled beam rebar structure D can also be installed.

In the above embodiment, the receiving stand 30,
Although the wire hooking protrusions 10 and 11 are provided on the unwinding portion 2 of 31, the hole may be a hole through which the wire 25 can be inserted and hooked, or other wire hooking means may be used. Further, although the number of the fixing holes 8 is set to 6 in the embodiment, other numbers can be used. Also, in the above embodiment
As shown in FIG. 5, the lowering unit 2 fixes the winding cylinder 4
Although the tip 7b of the screw rod 7 is fitted into the hole 8,
It seems to be used conventionally for hoisting devices such as ropes.
Then, a worm wheel is fitted and fixed to the winding cylinder 4, and
Winding with a fixed worm gear that meshes with the home wheel
The rod can be rotatably supported on the frame plate 3 (shown in the figure.
Not). In this case, the winding rod is rotated to rotate the winding cylinder 4
Rotate and wind down the wire.

In the above embodiment, the receiving stand 30,
The non-slip portions 23, 24 of the wire 31 are formed by projecting two short cylinders on the side surface of the horizontal rod 1, but even one or three or more, or friction with the wire 25, Other structures are also possible as long as the structure has a function of gradually lowering the pre-assembled beam reinforcing bar structure D.

Further, in the above embodiment, the beam support rod 29 is used.
However, it is also possible to connect the openable and closable beam support ring to the tip of the wire 25 to form a receiving stand. in this case,
The beam support ring has a size capable of inserting and locking the beam upper end bar A, and when the pre-assembled beam rebar structure D is hooked, one of the beam upper end bar A at each end is hooked. Stop.

Further, in the above-mentioned embodiment, it is also possible to use a transportation means such as an existing carriage without using the beam carriage 42.

[0037]

EFFECTS OF THE INVENTION According to the present invention, since the receiving stand is erected on the upper end of the column main reinforcing bar and the pre-assembled beam reinforcing bar structure is suspended by the receiving stand,
It is possible to hang the pre-assembled beam rebar structure with only the cradle without using other devices while keeping the horizontal state, so if you lower it gradually while finely adjusting the position, the pre-assembled beam rebar structure Can be accurately installed at a predetermined position in the beam construction form with an error of about 1 cm, and a predetermined cover thickness can be secured. Further, the crane permanently installed in the field can be used for other work, and the efficiency of the whole work can be improved and the construction period can be shortened. Moreover, since the pre-assembled beam rebar structure can be manufactured in advance in a factory, etc., the accuracy is improved, and
Since the amount of work of skilled workers on site can be reduced, there is an effect that the construction period can be further shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing a process of a method according to an embodiment of the present invention, in which (a) is a diagram showing a state where a formwork is completed, and (b) is a perspective view showing a state in which a cradle is installed on a column main bar. , (C) is a perspective view showing a state in which a pre-assembled beam rebar structure is hooked on a receiving stand.

FIG. 2 is a plan view showing a usage state of the receiving stand according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line JJ of FIG.

FIG. 4 is a sectional view taken along line KK of FIG.

FIG. 5 is a wire winding used for the receiving stand of the embodiment of the present invention .
In the lower part , (a) is an enlarged plan view, (b) is an enlarged front view,
(C) is an enlarged side view.

6A and 6B are connecting metal fittings used for the receiving stand of the embodiment of the present invention, in which FIG. 6A is an enlarged side view, FIG. 6B is an enlarged rear view, and FIG.
Is an enlarged plan view.

7 (a) is an enlarged side view, FIG. 7 (b) is an enlarged rear view, and FIG. 7 (c) is an enlarged plan view of another connecting fitting of the embodiment of the present invention.

FIG. 8 is a perspective view of another connecting fitting of the embodiment of the present invention.

FIG. 9 is a perspective view for explaining a state where the beam suspension rod and the wire are hooked in the receiving stand of the embodiment of the present invention.

FIG. 10 is a front view of another receiving stand according to the embodiment of the present invention.

FIG. 11 is a beam carrier used in an embodiment of the present invention,
(A) is a side view and (b) is a front view.

[Explanation of symbols]

 1 horizontal rod 2 unwinding part 15, 54, 55, 56 connecting metal fittings 25, 26 wire 29 beam support rod 30, 31 cradle (winch) 41 beam carrier 42 main rebar for column 43 beam construction form 44 formwork Floor A, B Main beam reinforcement D Pre-assembled beam reinforcement structure

Claims (4)

[Claims] 1. A method of installing and constructing a pre-assembled beam reinforced structure in a formwork in a reinforced concrete building, wherein after constructing a main pillar rebar and a formwork, the formwork is first placed above a beam construction planned position of the formwork. Placing a braided beam rebar structure, and temporarily installing winches at the upper ends of the column main rebars located around both ends of the beam construction planned position, respectively, and at the same time, to the winches at both ends of the pre-assembled beam rebar structure. After being hooked respectively, the pre-assembled beam rebar structure is gradually lowered and placed at a predetermined beam construction planned position, and then the winch is removed from the column main rebar and the pre-assembled beam rebar structure. Beam construction method for reinforced concrete structures. 2. In a reinforced concrete building, a wire lowering portion is installed at a central portion of a horizontal rod having connecting metal fittings hooked on upper ends of main pillar reinforcing rods attached to both ends thereof, and the wire lowering portion has a lower end portion. A beam construction cradle characterized in that an upper end of a wire connecting a beam support portion is attached to the pedestal. 3. The beam construction cradle according to claim 2, wherein the connecting metal member and the horizontal rod are slidably attached. 4. A wire anti-slip part is installed on the horizontal rod,
The intermediate portion of the wire is hooked on the non-slip portion.
The pedestal for beam construction described in.